Create an insecure bank application

webroot/lib/View/MoneyFormatter.php

@@ -0,0 +1,30 @@
+<?php
+declare(strict_types=1);
+
+namespace View;
+
+class MoneyFormatter
+{
+    public static function formatAmount(int $amount): string
+    {
+        if ($amount < 0) {
+            $inner = static::formatAmount(-$amount);
+            return "<span class=\"negative\">- {$inner}</span>";
+        }
+        $euro = intdiv($amount, 100);
+        $cent = sprintf("%02d", $amount % 100);
+        return "{$euro},{$cent} €";
+    }
+
+    public static function parseAmount(string $amount): ?int
+    {
+        $pattern = '/^([0-9]+)(,([0-9]{2}))?$/';
+        if (preg_match($pattern, $amount, $matches)) {
+            $euro = (int) $matches[1];
+            $cent = (int) ($matches[3] ?? 0);
+            $amount = 100 * $euro + $cent;
+            return (int) $amount;
+        }
+        return null;
+    }
+}